TT 


BANCROFT 
LIBRARY 

•0- 

THE  LIBRARY 

OF 

THE  UNIVERSITY 
OF  CALIFORNIA 


OF 


TRINITY  MINING  COMPANY, 


OF 


TRINITY  MINING   COMPANY, 

GALENA,   Lander   Co, 

NEVADA. 


100,000  SHARES-Par  Value  $25.00. 


Office,  JJo.  61  (Broadway,  ((Room  4^^)  JJew  York. 


J.  G.  COOPER,  President,  and  Superintendent  at  Mines 
B.  A.  OXNARD,   Vice-President, 

D.   B.   HORTON,  Secretary. 

H.  M.  FRANCIS,    Treasurer, 

JOHN  P.  ADAMS,  Counsel, 
194  BROADWAY. 


IDIUr^E  OTO  :EH.S- 

J.  G.  COOPER,  GALENA,  Nevada. 

B.  A.  OXNARD,   Sugar  Refinery,  cor.   Dock   and   Water 

Streets,  Brooklyn,  N.  Y. 

D.  B.  HORTON,  WELLS  FARGO  &  Co.,  65  Broadway. 
H.  M.  FRANCIS,  Cashier,  do.  do. 

REGINALD  G.  BARCLAY,  BARCLAY  &  Co., 

14  and  1 6  Beaver  Street. 

OTTO   WITTE,  HAGEN  &  BILLING,  No.  i  Wall  Street. 
ALEXANDER  BARRY,  14  and  16  Beaver  St.,  N.  Y.  City. 


Office  of  TRINITY  MINING  CO., 

No.  61    BROADWAY,   Room  49. 

Your  attention  is  called  to  the  following  reports  and 
statements,  in  full  confidence  that  a  very  remunerative 
investment  in  well  developed,  constantly  paying  property 
is  offered.  It  is  very  advantageously  situated.  A  large 
concentrating  mill,  embodying  all  latest  imprcvements,  is 
now  building  by  the  Montrose  Mining  Company,  within 
half  a  mile  of  these  mines ,  and  ((  smelters }'  are  soon  to 
be  erected  at  the  railroad. 

*The  JVevada  Central  (Railroad,  recently  completed, 
has  opened  up  a  large  supply  of  excellent  wood  and  timber, 
and  will  greatly  reduce  the  cost  of  supplies  and  mining 
expenses. 

The  Company  own  valuable  mill  sites,  water  rights , 
and  ample  buildings  for  dwellings,  shops,  stables,  &c.,  and 
tramways,  cars,  loading  pockets  and  roads  are  already 
constructed. 

(Best  prices  can  be  obtained  for  ores,  as  those  already 
shipped  are  much  sought  for,  the  ores  being  rich  in  lead, 
easily  worked,  and  valuable  for  their  fluxing  qualities. 
A  shipment  during  January,  1880,  of  80  tons,  from 
these  mines  brought  in  Salt  Lake  about  $300  per  ton, 
the  full  value,  as  they  enabled  the  smelters  to  work  a 
large  quantity  of  low  grade  ores  poor  in  lead. 

The  mines  are  now  in  condition  to  furnish  fifty  tons  of 
ore  daily,  which  will  enable  the  Company  to  pay  hand= 
some  monthly  dividends.  They  are  of  great  extent,  and 
will  pay  for  a  long  time,  before  great  depth  or  rmich 
water  is  encountered.  The  treasury  shares  now  offered 


are  to  be  sold  as  a  working  capital,  and  to  erect  tlie  proper 
machinery  for  the  reduction  of  the  ores.  Mills  can  be 
built  and  mines  put  on  a  dividend  paying  basis  by  June- 
•next.  It  is  confidently  submitted  that  no  more  surely 
paying  investment  is.  attainable. 


NEW  YORK,  December  isf,  1879. 

To  the  Stockholders  of  the  Trinity  Mining  Co.  : 

The  following-  communications  relating  to  the  property 
of  the  Trinity  Mining  Company,  have  been  received,  and  are 
furnished  for  your  information: 


BATTLE  MOUNTAIN,. 

November  loth,  1879.  ' 

JAMES  G.  COOPER,  Esq., 

President  Trinity  Mining  Cmnpuny  : 

SlR:  —  In  accordance  with  your  instructions,  I  have  visited! 
and  examined  the  mineral  properties  known  as  the  "  Trinity  " 
and  "  Butte  "  Silver  Mines.  These  mines  are  situated  in  the 
immediate  neighborhood  of  Galena,  in  Battle  Mountain  Min- 
ing District,  Lander  County,  Nevada.  Galena  is  distant  14 
miles  from  Battle  Mountain  Station  on  the  Central  Pacific 
Railway,  with  which  it  is  connected  by  a  good  wagon  road. 
The  mines  are  at  an  altitude  of  about  6,000  feet  above  the 
sea,  and  about  1,500  feet  above  Reese  River  Valley.  The 
climate  is  temperate,  and  work  can  be  carried  on  uninterrupt- 
edly throughout  the  year.  The  country  is  entirely  devoid 
of  timber,  the  only  vegetation  in  the  neighborhood  being 
sage  brush.  Mining  timber  and  lumber  can  be  obtained  from 
the  mills  at  Truckee,  and  delivered  at  Galena  for  about  $30 
per  thousand.  Cord-  wood  for  fuel  costs  $10  per  cord  de- 
livered in  quantity.  Preferable  for  fuel,  however,  is  Wyo- 
ming coal,  which  is  delivered  at  the  mines  for  $20  per  ton. 


THE  TRINITY  MINE. 

The  claim  consists  of  1,000  feet  by  300  feet,  located  on  the 
Trinity  Ledge.  This  is  a  large  and  well  denned  mineral 
vein,  which  has  been  traced  for  a  long  distance  on  the  surface, 
in  many  places  out-cropping  boldly.  Its  course  is  North  and 
South,  and  its  dip  vertical.  The  average  width  as  shown  in 
workings  is  about  six  feet. 

The  vein  is  contained  between  well-defined  walls  with  clay 
selvages,  and  showing  unmistakeable  evidences  of  permanency 
and  strength.  The  country  rock  is  Grey-wacke.  The  ore 
consists  of  Argentiferous  Galena  and  the  products  of  its 
decomposition,  these  being  oxides  and  carbonates  of  lead 
rich  in  silver  As  greater  depth  is  attained  the  proportion 
of  undecomposed  Galena  will  probably  increase.  The  ore  is 
distributed  throughout  the  vein  in  pay  streaks  and  bunches, 
these  varying  in  assay  value,  occasionally  being  as  high  as 
$300  per  ton. 

The  principal  workings  on  the  vein  consist  of  two  adit  tun- 
nels run  in  on  the  course  of  the  vein.  The  lower  of  these  is 
about  500  feet  in  length  ;  at  this  distance  it  is  connected  with 
the  surface  by  a  shaft  200  feet  in  depth.  300  feet  from  its 
mouth  it  is  connected  with  the  upper  tunnel  by  a  winze  100 
teet  in  depth.  The  upper  tunnel  is  125  feet  in  length,  its  end 
being  connected  with  the  surface  by  an  up-raise  of  40  feet. 

Below  the  level  of  the  lower  tunnel,   water  is  met  with, 
and  in  sinking  it  will  be  necessary  to  provide  for  pumping* 
This  water  can  be  kept  under  control  by  a  small  steam  pump 
or  hoisted  in  a  water  bucket  for  the  next  200  or  300  feet. 

I  carefully  sampled  the  mine  at  different  points,  with  a 
view  of  ascertaining  the  value  of  the  ore.  These  samples 
were  submitted  to  fire  assay  and  with  the  following  results : 

No.  i.  An  average  across  the  face  of  the  south  drift  from 
bottom  of  the  winze.  This  yielded  per  ton  of  2000  Ibs., 

Silver $37.90 

Gold.  .  , ...      6.0Q 


Total $43«9° 


No.  2  was  taken  from  the  bottom  of  the  winze,  at  a  point 
where  a  new  ore  body  appears.  This  yielded, 

Silver $79.59 

Gold 3-°° 

Total t* $82-59 

No.  3  was  taken  from  the  upper  workings  of  the  mine, 
where  a  body  of  low  "grade  ore,  capable  of  concentration,  24 
inches  wide,  was  left  after  stoping  out  the  higher  grade. 
This  gave  by  assay, 

Silver $62.53 

Gold 3-°° 

Total : • $65.53 

No.  4.     In  the  north   drift  from  the  bottom  oi  the  winze 

there  are  two  streaks  of  ore,  each  about  8  inches  wide.     An 

average  sample  of  these  gave, 

Silver $63.40 

Gold 7-5° 

Total $70.90 

No.  5.     In  the  lower  tunnel  an  18  inch  streak  gavey 

Silver $26.53 

Gold 3-oo 


Total -$29.53 

No.  6.     An  average  sample  of  the  second  class  ore  on  the 
dump,  gave, 

Silver $75-.  5  8 

Gold ........  —  . .      3.00 

Total , ...$78.58 

No.  7.     An  average  sample  of  the  first  class  ore  on  the 
dump-,  gave, 

Silver $132. 65" 

Gold „       7..  5.0 

Total.. $140.15; 

It  is  my  opinion  that  when  properly  developed  and  stoping1 
ground  opened  up,  the  mine  will  be  capable  of  furnishing  a 


large  body  of  excellent  ore  for  concentration,  and  also  a 
remunerative  quantity  of  first-class  ore  ready  for  shipment 
to  the  smelter  without  further  treatment  at  the  mine. 


THE     BUTTE     MINE. 

This  claim  is  also  1,000  feet  in  length  by  300  feet  in  width. 
The  Jedge  is  a  strong,  well-defined  fissure  vein  in  the  same 
country  rock  as  the  Trinity,  from  which  it  is  distant  about 
one  mile.  The  general  course  is  N.  30  E.  magnetic.  It  dips 
50°  to  the  northwest ;  its  width,  as  far  as  displayed,  varies 
from  two  feet  to  over  fifteen  feet.  The  hanging  wall  is  very 
clearly  defined  throughout  the  workings. 

The  vein  matter  is  very  similar  to  that  of  the  Trinity,  ex- 
cepting that  the  decomposition  of  the  ore  has  been  carried 
to  a  greater  extent. 

The  mine  has  been  opened  by  an  adit  tunnel  430  feet  in 
length.  Above  this  tunnel  the  ore  has  been  stoped  out  to 
the  surface,  a  distance  at  the  tunnel  heading  of  over  200  feet. 
Below  the  tunnel  level  two  winzes  have  been  sunk  to  a  depth 
of  about  forty-five  feet ;  only  one  of  them,  the  most  south- 
erly, was  accessible  at  the  date  of  my  visit.  Thus  far  no 
water  has  been  met  with  at  the  mine. 

I  took  samples  of  the  vein  matter  with  the  following  re- 
sults : 

No.  i.  Screenings  from  the  upper  stopes.  The  Superin- 
tendept  estimates  that  there  are  about  500  tons  of  this 
material  lying  loose  in  the  stopes.  Samples  taken  at  ran- 
dom and  mixed  yielded, 

Silver $56.85 

Gold 4. 5  o 

Total $61.35 

No.  2.  An  average  from  the  first  class  ore  on  the  dump, 

Silver $151.65 

Gold 18.00 

Total $169.65 


8 

No.  3.  An  average  sample  taken  from  the  face  of  the  north 
drift  from  the  winze,  the  ore  streak  being  24  inches  wide, 
gave, 

Silver • $17.01 

Gold 7. 50 

Total $24.51 

No.  4.  An  average  across  ten  feet  of  vein  matter  in  the 
roof  of  the  adit,  capable  of  concentration,  gave, 

Silver $3-79 

Gold 3.00 

Total $6.79 

i 

No.  5.  An  average  from  stope  in  south  drift  from  winze 

ore  streak  12  inches  wide,  heavy  mineral, 

Silver $155.44 

Gold 4. 50 

To:al $  1 60. 94 

It  will  not  require  a  great  deal  of  work  to  open  up  this 
mine  below  the  tunnel  level  so  as  to  put  it  in  a  condition  to 
furnish  a  large  quantity  of  ore  of  a  very  good  class.  It  will 
be  seen  from  the  results  of  the  preceding  examination  that  a 
very  good  grade  of  ore  is  furnished  by  both  mines.  The 
average  percentage  of  lead  in  the  heavy  pay  streaks  will  be 
about  40/0.  Concentration  will  increase  this  two-fold.  The 
lower  grade  will  be  benefitted  of  course  in  a  still  greater 
degree  of  concentration. 

There  is  every  reason  to  believe  that  under  proper  man- 
agement the  Trinity  and  Butte  Mines  will  be  a  remunerative 
investment  to  the  owners.  They  are  in  my  opinion  second 
to  no  other  property  in  the  Galena  Distript. 

Very  truly  yours, 
(Signed)     D.  ERNEST  MELLISS, 

Mining  Engineer. 


GALENA,  NEV.,  Dec.  jilt,  1879. 

H.  M.  FRANCIS,  Esq., 

Treasurer  Trinity  Mining  Company,  New  York  City. 

SIR  :  As  requested,  I  have  made  examination  of  Title  and 
Property  of  the  Trinity  and  Butte  Mining  properties,  and 
give  you  herein  the  results  of  my  investigation. 

Title  and  Past  History. — The  Title  is  a  Sheriff's,  dating  back 
seven  or  eight  years — during  which  time  it  has  been  worked 
to  a  profit  by  the  owner,  J.  A.  Blossom. 

The  Trinity  Mine  is  situated  in  Battle  Mountain  District, 
Lander  Co.,  Nevada,  14  miles  from  the  C.  P.  R.R.  Station 
of  Battle  Mountain,  and  6  miles  from  the  Central  Nevada 
Railroad,  (Narrow  Gauge)  ;  good  roads  and  light  grade  ; 
water  limited  at  present,  and  no  fuel  in  the  district,  but  the 
railroad  destroys  this  last  objection.  Supplies  and  'labor 
gotten  correspondingly  cheap  on  account  of  proximity  to 
railroad. 

Country  Rock. — This  mine  is  a  true  fissure  vein  in  slate, 
grey-wacke  and  limestone  (similar  to  the  Hartz  mountains  in 
Germany  and  Guanajuato,  in  Mexico,  where  are  the  oldest 
and  best  mines  in  the  world). 

Character  of  Ores. — Carbonates  of  lead,  galena,  sulphides 
of  silver,  chlorides  of  silver,  and  a  little  gold. 

The  ore  of  this  mine  has  averaged  $130  or  more,  but  large 
bodies  of  $40  to  $60  ores  have  been  left,  together  with 
higher  grades,  above  the  tunnel. 


Plan  of  zvork  done- 


10 

or  600  x  200  -i-  2  =  60,000  x  8  width  = 

480,000  cubic  feet  -j-  12  =  40,000  tons  of  vein  matterr 

Now  extracted  and  on  the  dumps,  20,000     " 

Remaining  in  the  mine, 20,000  tons. 

one-half  of  which  is  good  ore,  or 

10,000  tons  worth  $60  minimum __ $600,000 

Below  the  tunnel  we  have  a  right  to  estimate  50  % 

of  what  we  can  see  as  a  reasonable  probability,  or  3,00,000 
more.  We  still  have  400  feet  of  ground  to  explore 

to  the  north  (claim  is  1,000  feet  in  length)r  so  I 

would  safely  estimate  on i  ,000,000 

of  ore  in  sight. 

Plan  of  Reduction. — There  is  shipping  ore  in  sight,  and  much 
to  be  concentrated.  The  Tailings  can  be  panned  at  some 
future  day,  if  they  contain  gold  or  chlorides.  I  will  send  you 
a  special  paper  covering  this  subject,  after  my  investigation? 
into  the  Butte  property. 

Having  had  a  varied  practical  experience  of  fourteen  years, 
my  opinion  of  the  Trinity  Mine  has  been  formed  after  a  care- 
ful examination  for  the  past  six  months. 

Yours  truly, 
(Signed)  C.  B.  DAHLGKEN, 

Machinist  and  Mining  Engineer* 


GALENA,  Dec:  $ot/i,.  1879. 
J.  G.  COOPER,  ESQ., 

President  Trinity  Mining  Co.,  Galena,  Nevada. 

DEAR  SIR, — Repeated  visits  to  the  Butte  and  Trinity  Mines,. 
and  the  nature  of  my  business  as  an  Assayer  and  Mining 
Engineer  have  given  me  many  opportunities  to-  learn  facts 
and  make  observations  concerning  both  of  these  mines.  In 
the  following  remarks  please  find  some  of  these  observations- 
and  facts,  also  some  of  the  conclusions  I  was  enabled  to  draw 
from  a  knowledge  of  these  facts  and  observations. 


II 

The  Trinity  Mine  is  located  on  an  extensive  mineral  belt, 
which  runs  in  a  northerly  and  southerly  direction,  and  which 
can  be  traced  for  miles  north  and  south  from  your  claim. 
The  mineral  deposits  in  this  belt,  which  in  its  course  cuts 
through  different  changes  of  country  rock,  show  all  the  char- 
acteristics of  a  true  fissure  vein  or  system  of  veins,  promising 
a  permanent  production  of  high  grade  ores.  The  average 
width  of  the  vein  I  should  judge  at  about  five  feet ;  the  ore  in 
the  vein  occurs  in  a  pay  streak  of  from  four  to  eighteen 
inches  in  width,  forming  lodes  of  concentrated  ore  of  con- 
siderable longitudinal  and  vertical  dimensions,  accompanied 
with  vein  matters,  and  mixed  ore,  the  whole  making  up  an 
average  width  of  about  five  feet. 

The  character  of  the  ore  as  far  as  I  have  been  able  to  ob- 
serve, is  an  argentiferous  galena  with  its  different  products  of 
decomposition,  containing  half  ounce  of  gold  from  70  to  200, 
and  in  extreme  cases  to  600  ounces  of  silver  per  ton,  when 
containing  60%  of  lead.  Iron  pyrites,  arsenical  iron,  blende 
and  copper  pyrites  are  present,  but  none  of  these  minerals 
are  rich  in  silver  and  goldi,  yielding  when  concentrated,  not 
over  $25  per  ton  in  both* metals.  I  have  not  been  able  to 
detect  any  other  silver  ores,  and  therefore  I  think  the  mine 
will  produce  at  greater  depth  smelting  ores  exclusively,  the 
milling  ores  as  products  of  natural  decomposition  of  the 
galena  being  confined  to  ores  near  the  surface. 

From  the  openings  of  the  mine  in  1 869,  considerable  first- 
class  ore  was  obtained,  and  the  first  shipment  made  in  the 
beginning  of  1870,  consisted  in  ore  of  ^%  lead  and  $180  in 
silver  per  ton.  Since  then  the  mine  has  been  worked  period- 
ically, and  a  considerable  amount  of  ore  been  shipped,  contain- 
ing from  50  to  60%  lead,  and  from  $120  to  $225  in  silver  per 
ton. 

The  second-class  ores  have  been  left  on  the  dumps,  and  are 
mixed  with  vein  matter  and  poor  ores. 

The  sixty  tons  worked  here  averaged  about  $40  per  ton, 
and  yielded  90$  of  their  assay  value  by  chloridizing  roasting, 
and  leaching.  They  consisted  in  products  of  decomposition 
of  galena  and  other  sulphates  exclusively. 


12 

The  present  lower  tunnel  will  give  a  good  opportunity  to 
ascertain  by  cross-cutting-  the  size  and  character  of  the  vein 
or  system  of  veins,  as  they  occur  in  the  limits  of  your  claim. 
The  adoption  of  a  plan  for  future  lower  works  will  depend  upon 
these  explorations.  In  the  meantime  the  whole  of  the  vein 
and  its  branches  could  be  stoped  out  above  the  tunnel  level 
without  interfering  in  the  least  with  future  operations.  This 
would  furnish  a  large  amount  of  mostly  second-class  orer 
which  I  should  judge  will  average  from  $25  to  $30  per  ton 
in  silver,  and  leave  a  net  profit  of  from  $7  to  $10  above  run- 
ning, concentration  and  smelting  expenses.  The  amount  of 
these  reserves  above  the  tunnel  level  I  would  place  at  from 
4,000  to  5,000  tons. 

Considering  the  size  of  the  vein  and  its  ore-bearing  char- 
acter, as  developed  in  the  upper  works,  I  should  place  the 
permanent  production  of  the  mine,  when  properly  opened, 
at  from  20  to  25  tons  of  ore  daily,  of  a  value  of  $30  per  ton, 
resulting  in  a  daily  net  yield  of  from  $200  to  $250. 

In  this  estimate  I  do  not  include  the  not  improbable  chance 
of  meeting  large  lodes  of  concentrated  ore.  which  of  course 
might  increase  the  amount  of  the  net  product  to  any  multiple 
of  the  figures  given. 

The  Butte  Mine  is  located  on  a  parallel  belt  east  of  the 
Trinity  belt.  It  is  equally  prominent  and  can  be  traced  for 
miles  north  and  south  of  your  claim.  There  are  evidently 
different  ore  channels  existing  in  this  belt,  the  width  of 
which  is  from  150  to  200  feet  on  the  Butte  Hill  where  your 
claim  is  located.  Since  1870  but  very  little  work  has  been 
done ;  enough,  however,  to  leave  no  doubt  about  the  char- 
acter of  the  vein  or  veins  inclosed  in  this  belt,  and  which 
have  to  be  classed  as  true  fissure  veins. 

There  is  more  or  less  lead  in  all  the  Butte  ores,  either  as 
galena  or  its  products  of  decomposition  ;  but  their  principle 
value  consists  in  the  silver  ores,  chloride  and  sulphates  of 
silver  which  they  contain,  and  the  character  of  the  ore  might 
be  described  as  milling  ore. 

The  critical-  point  in  mines  of  this  character,  that  is  the 
line  where  the  chloride  surface  ores  change  into  sulphurets, 


has  been  reached  and  passed.  It  was  encountered  first  in 
the  north  incline  140  feet  below  the  surface  and  then  followed 
for  1 60  feet  deeper.  In  the  south  winze  the  line  of  contact 
has  been  reached  but  hardly  passed,  showing  that  the  line  of 
contact  between  chlorides  and  sulphurets  conforms  with  the 
configuration  of  the  surface  ground.  In  both  instances  it  has 
been  demonstrated  that  the  sulphuret  ores  correspond  in 
their  richness  with  the  chlorides  found  nearer  to  the  surface. 
The  average  of  the  Butte  ores  is  about  $40  per  ton  and  $3 
gold.  The  first  class  ores  yield  from  $100  to  $1,500  in  silver 
per  ton  and  are  found  in  seams  of  from  two  to  ten  inches  in 
width.  The  original  owners  of  the  claim  in  1869,  realized 
from  265  tons  $50,544.  Their  successors,  the  Nevada  Butte 
Silver  Mining  Co.,  mined  and  milled  about  1,500  tons, 
of  an  average  assay  value  of  $40  per  ton.  These  opera- 
tions proved,  however,  a  financial  failure,  caused  by  the 
method  employed  for  working  these  ores.  Using  simple  pan 
amalgamations,  the  resulting  bullion  ran  as  low  as  35  fine  in 
silver — was  in  fact  lead  bullion  containing  from  $1,500  to 
$2,000  in  silver  per  ton,  to  obtain  which,  for  each  ton  of  bul- 
lion from  five  to  six  tons  of  quicksilver  had  to  be  used.  In 
1878  I  had  a  lot  of  about  34  tons,  averaging  from  $70  to  $80 
per  ton  in  silver  worked  here  by  chloridizing  roasting,  and 
leaching  with  entirely  satisfactory  results,  as  I  received  go% 
of  the  assay  value  of  the  ore. 

All  the  present  works  of  the  Butte  mine  are  located  on  the 
western  branch,  or  on  the  hanging  wall  of  ihe  Butte  belt, 
showing' a  view  of  from  two  to  three  feet  in  width.  Future 
developments  will  have  to  decide  what  ore  bodies  exist  to 
the  east  up  to  the  foot  wall  of  the  belt.  So  far  surface  indi- 
cations are  the  only  guide  for  this  question  but  judging  from 
these,  the  chances  of  meeting  branches  of  large  size  and 
equally  as  rich  are  very  favorable. 

There  is  a  considerable  amount  of  chloride  standing  in  the 
southern  part  of  the  mine,  amounting  probably  to  almost 
2,000  tons,  and  of  an  average  value  of  $40.00  per  ton.  It  can 
be  extracted  by  the  means  of  the  south  shute  without  inter- 
ferencs  with  any  plan  which  might  be  adopted  for  the  open- 


H 

ing-  of  lower  works.  There  is  also  about  400  tor:G  of  ore  on 
.the  dumps  of  an  average  value  of  $30.00  per  ton. 

Considering  the  size  and  ore-bearing  character  of  the  vein 
as  developed,  I  should  judge  that  if  once  properly  opened,  a 
permanent  value  of  from  15  to  20  tons  per  day  can  be  ex- 
pected, of  an  average  yield  of  $40  per  ton,  giving  a  net  return 
of  from  $300  to  $400  per  day. 

The  mineralogical  character  of  the  Trinity  and  Butte  ore 
being  so  different,  different  methods  will  have  to  be  adopted 
for  their  working.  Concentration  and  subsequent  smelting 
will  eventually  be  the  only  method  adopted  for  the  Trinity 
ores,  although  there  is  yet  to  be  expected  from  the  upper 
works  of  this  mine  a  considerable  amount  of  chloride  ores 
which  could  be  worked  to  greater  advantage*  by  chloridizing 
roasting-,  and  subsequent  leaching.  The  Butte  ore  belongs 
entirely  to  this  latter  class,  and  roasting  and  leaching  are  for 
these  ores  the  proper  treatment. 

There  is  one  peculiarity  to  mention  about  the  Butte,  as 
well  as  the  chloride  ores  of  the  Trinity  mine  ;  that  is,  the  large 
percentage  of  silver  which  can  be  extracted  by  leaching 
without  previously  roasting  these  ores.  I  have  made  frequent 
trials  and  found  that  some  of  these  ores  are  often  naturally 
chloridized  to  such  an  extent  that  from  60%  to  80^  of  the 
contents  in  silver  can  be  extracted  at  once  by  leaching.  Of 
course  to  secure  satisfactory  results  in  all  cases  it  is  advisable 
to  subject  these  ores  to  a  chloridizing  roasting  ;  their  partial 
natural  chlorination  will,  however,  allow  a  considerable  re- 
duction in  the  amount  of  salt  to  be  used  in  roasting,  and  the 
time  required  for  roasting. 

Very  respectfully, 

JOHN  RAMDOHR. 


GALENA,  Nevada,  Jan.  4,  1880. 
H.  M.  FRANCIS,  Esq., 

Treasurer  Trinity  Mining  Co.,  New  York. 

DEAR  SIR, — I  have  visited  the  Trinity  and  Butte  Mines, 
belonging  to  the  Trinity  Mining  Company,  and  was  ex- 
tremely gratified  as  a  stockholder  to  find  that  »we  have  in 
them  such  large  bodies  of  easily  mined  rich  concentrating 
ores.  The  Trinity,  the  larger  of  the  two  properties,  is  a  true 
fissure  vein,  the  width  of  which  has  never  been  obtained  by 
cross-cutting.  The  ore  consists  mainly  of  galena,  carbonate 
of  lead,  half  decomposed  sulphides  of  lead  and  iron  pyrites, 
all  of  them  bearing  more  or  less  silver.  They  all  exist  in 
large  quantities,  there  being  already  in  sight  enough  to  take 
out  fifty  tons  per  day  for  nearly  one  year,  although  as  yet 
the  average  depth  attained  is  not  1 50  feet.  There  is  every 
reason  to  believe  that  the  mine  will  improve  in  depth. 

There  is  at  present  an  adit  driven  into  the  side  of  the  hill, 
by  which  the  ore  can  be  taken  out  without  any  expense  for 
hoisting.  Another  could  be  driven  at  the  bottom  of  the  hill, 
150  feet  lower,  by  which  the  hoisting  of  the  ore  could  be  fur- 
ther postponed  for  a  long  time. 

I  carefully  selected  average  samples  of  the  different  classes 
of  ore  and  had  them  assayed,  with  the  following  result  per 
ton: 

Silver.  Gold.  Total. 

Carbonates,                                $106   12  $24  oo  $130   12 

Pyrites  and  Lead.     -                   175°  75°  25  oo 

Half  Decomposed  Galena,         46  23  3  oo  49  23 

Galena,     -  *      -                   -      100  43  7  50  107  93 

The  galena  is  the  ore  which  rather  preponderates  in  the 
mine,  and  I  should  consider  it  safe  to  say  that  the  average  of 
the  ore  in  the  mine  would  go  $80  per  ton. 

The  vein  in  the  Butte  Mine  is  considerably  smaller,  not 
being  more  than  four  or  five  feet  wide,  but  I  am  informed 
that  very  rich  chloride  ores  are  found  in  it.  There  are  none 
of  those  rich  ores  in  sight,  as  they  have  been  "  gouged  "  out 
by  the  parties  who  owned  the  mine  before  we  did.  When 


i6 

the  mine  is  further  opened  up,  our  Superintendent  expects  to 
strike  more  of  these  rich  ores  which  go*several  hundred 
dollars  to  the  ton.  All  the  lower  grade  concentrating  ore 
has  been  left,  and  a  large  amount  of  this  is  immediately  avail- 
able. This  class  consists  mainly  of  a  mixture  of  carbonates 
and  sulphides  of  lead.  I  took  three  average  samples  from 
the  mine,  and  had  them  assayed,  with  the  following  result : 

Silver.  Gold.  Total. 

No.  i,  $41   69         $12  oo         $53  69 

No.  2,    -  60  64  9  oc  69  64 

No.  3,  37  90  3  oo  40  90 

I  should  say  that  25  to  30  tons  of  this  ore  could  be  taken 
out  daily.  This  property  comes  with  its  excellent  sites  for 
concentrating  mills. 

To  sum  up  my  impressions,  I  think  we  have  here  mines, 
which  properly  managed,  will  give  us  returns  far  beyond  our 
expectations.  I  have  consulted  with  disinterested  parties 
here  who  have  visited  these  mines,  and  they  all  unite  in 
speaking  most  favorably  of  them. 

Truly  yours, 
(Signed)  B.  A.  OXNARD. 

Mr.  Oxnard's  assertions,  I  as  a  practical  mining  engineer 
of  fifteen  years'  experience,  consider  as  very  conservative, 
and  time  will  fully  verify  them. 

(Signed)  C.  B.  DAHLGREN. 

GALENA,  Jan.  tfh,  1880, 


Manufactured  by 
YLORD  BROS.  Inc. 
Syracuse,  N.Y. 
Stockton,  Calif. 


